JP4953519B2 - Masking material for painting - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a coating masking material used for protecting a predetermined position so that the coating is not applied to a predetermined position of an object to be coated.
[0002]
[Prior art]
At the time of painting, a masking material is attached to a portion (masking portion) that should not be painted on the object to be coated. The masking material is removed after the coating film is dried and cured by heat treatment after coating and loses fluidity. Therefore, the masking material must be able to withstand the heat treatment in such a painting process.
[0003]
As such a masking material, there is conventionally provided a material made of a thermoplastic plastic mixed with an inorganic filler (Japanese Patent Laid-Open No. 2-126966). Among thermoplastic materials, especially polyolefin is rich in solvent resistance, and by mixing an inorganic filler, the polyolefin is mechanically reinforced, and the thermal conductivity is increased to improve heat resistance. The masking material can be used repeatedly in the painting process.
[0004]
However, in the conventional masking material, heat resistance is at most about 100 ° C. even when an inorganic filler is mixed with thermoplastic, and in the case of a coating process that requires heat treatment at a temperature higher than that. There is a problem that the masking material is deformed and cannot be used repeatedly.
[0005]
To solve this problem, the masking material for engineering plastics and materials have been provided (Japanese open flat 5-261323). Masking materials made of engineering plastics can withstand high-temperature heat treatment at 150 ° C. or higher, and can be used repeatedly in coating processes including such high-temperature heat treatment.
[0006]
[Problems to be solved by the invention]
However, the engineering plastic has a high softening point and poor flowability of the melt, so it is inferior in moldability, and because it has high hardness and brittleness, it may cause fracture such as cracks and cracks when a large external force is applied. The coating film formed on the surface of the masking material with poor adhesion to the coating film peels off and scatters and adheres to the surrounding area to cause contamination.
[0007]
[Means for Solving the Problems]
The present invention provides an engineering plastic selected from the group consisting of methylpentene copolymer, polysulfone, polyethersulfone, polyphenylene sulfide, polyphenylene ether, polyamideimide, polyetherimide, and polyetheretherketone as means for solving the above conventional problems. A polymer alloy containing one or more of the following, polyamide and / or polystyrene, and a styrenic thermoplastic elastomer, wherein the engineering plastic and the polyamide and / or polystyrene are 30:70 to 70:30 weight The styrenic thermoplastic elastomer is mixed in a ratio of 2 to 20 parts by weight with respect to a total of 100 parts by weight of the engineering plastic and the polyamide and / or polystyrene. A sheet of a polymer alloy which is added is to provide a masking material which is produced by vacuum and / or pressure forming (11,21,31,41,51). Sheet having a thickness of the polymer alloy is preferably a 0.1 to 1.5 mm. The engineering plastic is preferably polyphenylene ether, and the polyamide is preferably nylon 6. Furthermore, it is desirable that the styrenic thermoplastic elastomer is a styrene-hydrogenated polyolefin-styrene block copolymer.
[0008]
The engineering plastic (hereinafter abbreviated as engineering plastic) used in the present invention is polysulfone (PSF), polyethersulfone (PES), polyphenylene ether (PPE), polyphenylene sulfide (PPS), polyetheretherketone (PEEK), polyamideimide. (PAI), polyetherimide (PEI), methylpentene copolymer (TPX) are selected. Two or more of the above engineering plastics may be mixed. Of the above engineering plastics, PPE is preferable from the viewpoint of moldability.
[0009]
In the present invention, polyamide and / or polystyrene is added to the engineering plastic. Examples of the polyamide include polytetramethylene adipamide (nylon 46), polyhexamethylene adipamide (nylon 66), polypyrosodon (nylon 4), polycaprolactam (nylon 6), polyheptlactam (nylon 7), Polycaprylactam (nylon 8), Polynonanolactam (nylon 9), Polyundeca 1 lactam (nylon 11), Polydodeca 1 lactam (nylon 12), Polyhexamethylene azelainamide (nylon 69), Polyhexamethylene sebacamide (nylon) 610), polyhexamethylene phthalamide (nylon 6iP), polyhexamethylene terephthalamide, polyhexamethylene isophthalamide, polytetramethylene isophthalamide, polymetaxylene adipamide, nylon MSD , Polyamide of hexamethylene diamine and n-dodecanedioic acid (nylon 612), polyamide of dodecane diamine and n-dodecanedioic acid (nylon 1212), hexamethylene adipamide / caprolactam (nylon 66/6), hexamethylene azimuth Pamide / hexamethylene isophthalamide (nylon 66 / 6iP), hexamethylene adipamide / hexamethylene terephthalamide (nylon 66 / 6T), trimethylhexamethylene oxamide / hexamethylene oxamide, (nylon trimethyl-62 / 62) , Hexamethylene adipamide / hexamethylene azelainamide (nylon 66/69), hexamethylene adipamide / hexamethylene azelainamide / caprolactam (nylon 66/69/6), poly (caproa) Dom / hexamethylene sebacamide) (nylon 6/610), poly (caproamide / hexamethylene dodecamide) (nylon 6/612) nylon MXD6, poly (caproamide / hexamethylene isophthalamide) (nylon 6 / 6I), aroma There are polyamides such as group polyamides. Two or more of the above polyamides may be used in combination.
Desirable polyamides are nylon 6, nylon 66, nylon 610, nylon 11, and nylon 12. The polyamide imparts toughness to the polymer alloy and facilitates deep drawing by vacuum and / or pressure forming.
[0010]
The polystyrene used in the present invention includes both general-purpose and impact-resistant polystyrene, but impact-resistant polystyrene is desirable.
In the present invention, a styrenic thermoplastic elastomer is further used. Examples of the styrenic thermoplastic elastomer include styrene-butadiene-styrene block copolymer (SBS), styrene-isoprene-styrene block copolymer (SIS), α-methylstyrene-butadiene-α-methylstyrene block copolymer ( α-MeS-Bd-MeS), α-methylstyrene-isoprene-α-methylstyrene block copolymer, styrene-hydrogenated polyolefin-styrene block copolymer (SEBS), etc. There is SEBS in terms of weather resistance and heat resistance.
[0011]
The above engineering plastic and rubber and / or elastomer mixture includes calcium carbonate, magnesium carbonate, barium sulfate, calcium sulfate, calcium sulfite, calcium phosphate, calcium hydroxide, magnesium hydroxide, aluminum hydroxide, magnesium oxide, titanium oxide, Iron oxide, zinc oxide, alumina, silica, diatomaceous earth, dolomite, gypsum, talc, clay, asbestos, mica, glass fiber, carbon fiber, calcium silicate, calcium carbonate, bennite, white carbon, carbon black, iron powder, Inorganic fillers such as aluminum powder, stone powder, blast furnace slag, fly ash, cement, zirconia powder, natural fibers such as cotton, hemp, bamboo fiber, palm fiber, wool, polyamide fiber, polyester fiber, acrylic fiber, viscose fiber, Acetate Organic synthetic fibers such as fiber, vinyl chloride fiber, vinylidene chloride fiber, asbestos fiber, glass fiber, carbon fiber, ceramic fiber, metal fiber, whisker and other inorganic fibers, linter, linen, sisal, wood powder, palm powder, walnut powder A reinforcing material such as an organic filler such as starch or wheat flour may be added to improve shape retention, dimensional stability, compression and tensile strength, and the like. The filler is usually added in an amount of about 0.5 to 200% by weight with respect to the engineering plastic.
[0012]
If necessary, the above polymer alloy further includes polyolefin such as polyethylene, polypropylene, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer, vinyl chloride resin, acrylic resin, methacrylate resin, vinylidene chloride resin, One kind or two or more kinds of thermoplastic plastics such as vinyl propionate resin, styrene-butadiene copolymer, and polyester resin may be mixed.
[0013]
The above polymer alloy may be colored with a pigment or a dye to identify a masking site, and may be color-coded. Further, a plasticizer such as DOP or DBP, an antioxidant, an antistatic agent, a crystallization accelerator, a difficult A foaming agent such as a flame retardant, a flameproofing agent, an insecticide, an antiseptic, a wax, a lubricant, an antiaging agent, an ultraviolet absorber, a chemical foaming agent or a capsule type foaming agent may be added. These components may be added singly or in combination of two or more.
[0014]
In order to manufacture a masking material by the above polymer alloy, a method of forming a predetermined shape by performing vacuum forming or vacuum / pressure forming in a film or sheet can be accurately formed, and a large amount can be formed. Although it is the most suitable method for production, other than that, pressure forming, press forming, blow molding, injection molding, etc. may be applied.
Polyethylene, polypropylene, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer and other polyolefins, vinyl chloride resin, acrylic resin, methacrylate resin, vinylidene chloride resin, styrene A sheet of a thermoplastic plastic such as a resin, a vinyl propionate resin, a styrene-butadiene copolymer, a polyester resin, or a foamed sheet of the thermoplastic plastic may be laminated.
[0015]
A part or all of the surface of the masking material made of the polymer alloy may be subjected to a treatment such as a corona discharge treatment or a primer treatment to further enhance the affinity for the paint or adhesive. Primers used in the above primer treatment include chlorinated polypropylene, modified polyolefin or olefin copolymer such as ethylene-vinyl acetate copolymer, styrene-butadiene rubber, acrylonitrile-butadiene rubber, chloroprene rubber, and synthetic rubber such as polybutadiene. Acrylic synthetic resins, vinyl synthetic resins or acrylic synthetic resins containing amino groups, amide groups, etc., vinyl synthetic resins, synthetic rubbers such as amino synthetic resins and epoxy resins, or synthetic resin primers, or aluminum isopropyl Rate, aluminum alcoholate or aluminum chelate compound such as aluminum trisacetylacetonate, alkyl metal such as 2-ethylhexyl lead, hexadecyl lithium, dibutyltin diacetate, di Organotin compounds such as n-butyltin dioxide, silane compounds such as methylvinyldichlorosilane, metal complex salts of 1,3-dicarbonyl such as acetylacetone lithium and acetylacetone beryllium, organotitanium compounds such as tetrabutyltitanate, triborate borate Boric acid compounds such as n-butyl and triphenyl borate, phosphate esters such as trioleyl phosphate and tridecyl phosphate, metal carboxylates such as magnesium stearate and cobalt naphthenate, and n-dodecyl mercapto potassium salt Metal thioalcolate, thiodicarboxylates such as zinc 2-ethylhexanedithioate, dithiocarbamate metal salts such as nickel dimethyldithiocarbamate, copper dimethyldithiocarbamate, metal sulfonates such as nickel benzenesulfonate, dibutyl There are primers low molecular weight such as organic phosphoric acid metal salts such as phosphate vanadium, the primer is used as one or a mixture of two or more. As the primer, a synthetic resin or rubber having good adhesion to both a paint vehicle of engineering plastics used as the masking material and a synthetic resin other than engineering plastics generally used as an adhesive, or the above-mentioned various primers are used. Particularly desirable as the primer is an acrylic synthetic resin or amino synthetic resin containing a quaternary ammonium salt.
[0016]
In order to perform primer treatment using one or a mixture of two or more of the above various primers, a solution or emulsion (latex) of one or two or more of the above various primers is applied to the surface of the masking material. dry.
Prior to the primer treatment, an affinity treatment may be applied to the surface of the masking material body. Examples of the affinity treatment include flame treatment and sulfuric acid treatment for slightly carbonizing the surface to give affinity, corona discharge treatment for roughening and slightly carbonizing the surface, and the like.
[0017]
[Action]
Engineering plastics are rich in heat resistance, and masking materials made of these materials have high mechanical strength and do not soften and deform even at temperatures of 150 ° C. or higher. When polyamide and / or polystyrene and styrene thermoplastic elastomer are mixed with the above engineering plastics to form a polymer alloy, the moldability of the masking material is improved and the toughness and elongation are improved without much lowering the heat resistance. Even if the sheet is thin (usually 0.2 to 0.8 mm), deep drawing by vacuum and / or pressure forming is facilitated without breaking the sheet. Furthermore, even with a masking material formed from such a thin sheet, the breaking strength is greatly improved. The polymer alloy of the present invention also improves the affinity with the coating film.
[0018]
【Example】
[First embodiment]
1 to 4 show a first embodiment of the present invention. The masking material (11) of this embodiment is used for masking a columnar body such as an automobile center pillar (12). The masking material (11) includes a U-shaped main body (11A) having a fitting portion (11B) of the main body (12A) of the center pillar (12) on the inside, and both side walls of the main body (11A). (11C, 11C) flange fitting part (11D, 11D) that fits the flange (12B, 12B) of the center pillar (12) formed along the lower edge, and the flange fitting part (11D, 11D) is composed of a backing part (11E, 11E) extended from the upper part and an upper backing part (11F) extended to the upper part, and the main body (11A) has longitudinal reinforcing longitudinal ribs (11G) and Reinforcing transverse ribs (11H) in the short direction are formed. The masking material (11) is a polymer alloy sheet (thickness 0.4 mm) obtained by mixing 10 parts by weight of SEBS with 100 parts by weight of a PPE-nylon 66 (40:60 weight ratio) mixture and further mixing 5% by weight of calcium carbonate. ) By vacuum forming.
As shown in FIG. 2, the masking material (11) fits the body (12A) of the center pillar (12) into the fitting portion (11B) of the masking material (11), and further the center pillar (12) side. The edge flange (12B) is temporarily fitted to the flange fitting portions (11D, 11D) of the masking material (11).
After the temporary fixing, as shown in FIG. 3, the backing portions (11E, 11E) of the masking material (11) are folded and applied to the backing (12C) of the center pillar (12), and the backing portions (11E , 11E) is fixed with adhesive tape (14) or tucker.
In this way, after the masking material (11) is attached to the center pillar (12) as shown in FIG. 4, it is applied together with the masking material (11) with a thermosetting melamine-alkyd resin paint or the like.
[0019]
[Second Embodiment]
FIG. 5 shows a second embodiment of the present invention. The masking material (21) of this example is a U-shaped main body (21A) having a fitting portion (21B) of the main body (22A) of the center pillar (22) on the inside, and the main body (21A) Flange fitting portions (21D, 21D) for fitting the flanges (22B, 22B) of the center pillar (22) formed along the lower edges of the side walls (21C, 21C), and the flange fitting portions ( 21D, 21D) consists of a backing part (21E, 21E) and an upper part (21F) extended to the top, and around the body (21A), there are longitudinal reinforcing ribs (21G ) And a short rib (21H), but unlike the first embodiment, the longitudinal reinforcing rib (21G) is intermittent in this embodiment. The masking material (21) is a sheet of polymer alloy in which 15 parts by weight of SBS is added to and mixed with 100 parts by weight of a PPS-high impact polystyrene (50:40 weight ratio) mixture, and 3% by weight of carbon black is further mixed. Manufactured by vacuum-pressure forming (thickness 0.3 mm).
In the same manner as the masking material (11) of the first embodiment, the masking material (21) fits the main body (22A) of the pillar (22) into the fitting portion (21B) of the masking material (21). The flange (22B) on the side edge of the center pillar (22) is fitted to the flange fitting portion (21D, 21D) of the masking material (21) to be temporarily fixed, and the backing portion of the masking material (21) (21E, 21E) is folded and applied to the backing of the pillar (22), and the backing (21E, 21E) is fastened with an adhesive tape, a tucker or the like.
In this way, it is applied together with the masking material (21) by a paint or the like.
The masking material (11) of the first embodiment is easily bent along the reinforcing rib (11G) because the longitudinal reinforcing ribs (11G) are continuous, but the masking material (21) of this embodiment is easy to bend. Since the reinforcing rib (21G) in the longitudinal direction is intermittent, the bending rigidity along the rib (21G) is improved.
[0020]
[Third embodiment]
6 to 8 show a third embodiment of the present invention. In FIG. 6, (33) is a car body, and the masking material (31) of this embodiment is attached to the air intake (36) of the lower skirt part (35) of the front bumper (34) when painting. Vertical and horizontal reinforcing bars (36A, 36B) and a pair of left and right columns (36C) are provided inside the air intake port (36) of the skirt portion (35), and the masking material (31) has the Vertical and horizontal fitting grooves (32A, 32B) and fitting grooves (32C) for fitting the reinforcing bars (36A, 36B) and struts (36C) are formed, and a flange (32D) is formed on the front periphery. In addition, an adhesive layer (32E) is formed on the peripheral surface.
The masking material (31) is manufactured by vacuum forming a sheet (thickness 0.2 mm) of a mixture in which 8 parts by weight of SIS is added to 100 parts by weight of PPE-nylon 6 (50:50 weight ratio). The The masking material (31) is fitted inside the air intake port (36), and the reinforcing bars (36A, 36B) of the air intake port (36) are fitted into the fitting grooves (32A, 32B) of the masking material (31). ) And the column (36C) is fitted into the fitting groove (32C). The masking material (31) is fixed inside the air intake port (36) by the adhesive layer (32E). Note that the adhesive layer (32E) is not necessarily formed.
In this way, after attaching the masking material (31) to the air intake port (36) of the skirt portion (35) which is the masking part, the vehicle body (33) is painted, and the coating film is dried and cured by heat treatment after the coating. .
[0021]
[Fourth embodiment]
9 to 12 show a fourth embodiment of the present invention. The masking material (41) of the present embodiment is used for masking the window frame (44A) of the automobile door (44), and the masking material (41) has three members (41A, 41B, 41C) having an L-shaped cross section. Each member (41A, 41B, 41C) is formed with longitudinal reinforcing ribs (41D) and transverse reinforcing ribs (41E) in the short direction. The masking material (41) is formed by vacuum / pressure forming a polymer alloy sheet (thickness 0.5 mm) in which 20 parts by weight of SEBS is added to 100 parts by weight of a mixture of PPS-nylon 66 (70:30 weight ratio). Manufactured by.
In order to attach the masking material (41) to the window frame (44A) of the door (44), as shown in FIG. 10, each member (41A, 41B, 41C) of the masking material (41) is attached to the window frame (44A). ) And the connecting portions of the members (41A, 41B, 41C) are overlapped with each other, and the connecting portions are fixed from above with, for example, an adhesive tape (42).
In this case, as shown in FIG. 11, in the connection portion between the members (41A, 41B, 41C), the horizontal rib (41E) at one connection end is fitted below the horizontal rib (41E) at the other connection end. Further, as shown in FIG. 12, the upper edge flange portion (41F) of each member (41A, 41B, 41C) is hooked on the upper edge of the window frame (44A).
After painting, the masking material (41) is peeled from the window frame (44A) of the door (44). Since the window frame (44A) of the door (44) is protected by the masking material (41), no coating film is formed.
[0022]
[Fifth embodiment]
The fifth embodiment of the present invention is shown in FIGS. (52) is the instrument panel of the car, and the front has glove box mounting holes (55), audio mounting holes (56, 57), instrument mounting parts (58), accessory case mounting parts (59), etc. The instrument panel (52) is divided into an upper part (52A) and a lower part (52B).
[0023]
As shown in FIG. 14, the instrument panel (52) includes a base material (54) and a surface material (53) adhered to the surface of the base material (54). A skin material (53A) made of a nonwoven fabric, synthetic leather, etc., and a wadding material (53B) made of a nonwoven fabric, plastic foam sheet, etc. backed by the skin material (53A), the skin material (53A) It is colored in a predetermined color (base color), and the thickness of the wadding material (53B) can be changed elastically.
[0024]
A concave groove (54A) is provided in the base material (54) along the boundary between the upper part (52A) and the lower part (52B), and the cover material (53) is placed in the concave groove (54A) at this part. The parting line PL is formed by tightening. In the cover material (53), the thickness of the wadding material (53B) is compressed at the crimped portion, and is fixed in the concave groove (54A) by its elastic restoring force.
[0025]
The instrument panel (52) has the same upper and lower colors (base color) because the instrument panel (52) is decorated with a common upper and lower cover material (53). This may be attached to the car body as it is, but a masking material (51) as shown in FIG. The masking material (51) has a shape that fits in the upper part (52A) of the instrument panel (52), and an engaging flange (51A) is formed at the end edge.
[0026]
The masking material (51) is attached to the upper part (52A) of the instrument panel as shown in FIG. 15, and the engaging flange (51A) is inserted into the gap S of the parting line PL as shown in FIG. Fixed by. When the engaging flange (51A) of the masking material (51) is inserted into the gap S of the parting line PL, the thickness of the wadding material (53B) of the cover material (53) is compressed, and the elastic restoring force causes the The engaging flange (51A) is pressed and fixed by the cover material (53).
[0027]
After attaching the masking material (51) to the upper part of the instrument panel (52A), the lower part of the instrument panel (52B) is painted differently from the upper part (52A) by spray painting or the like. Remove the masking material (51) after painting. In this way, an instrument panel (52) having different colors as shown in FIG. 17 can be easily obtained.
[0028]
The masking material (51) of this example is 10 parts by weight of SEBS, 2 parts by weight of titanium oxide and 0.5 parts by weight of carbon black with respect to 100 parts by weight of a mixture of PPE-nylon 6 (40:60 weight ratio). the sheet (thickness 0.4 mm) of a polymer alloy obtained by mixing added bets are made by pressure forming forms to Rukoto.
[0029]
【Effect of the invention】
Excellent heat resistance, there is no risk of breakage such as cracks and cracks due to external force, moldability, especially deep drawing shape and complicated shape can be obtained accurately, vacuum forming, vacuum pressure forming or pressure forming suitable for mass production In this vacuum forming, vacuum pressure forming or pressure forming, it is possible to use a thin sheet as a raw material. material cost becomes cheaper, further has good adhesion of the coating film formed on the masking material, it no paint masking material coating film is scattered around and peeling can be obtained. Therefore, the coating masking material of the present invention can be used repeatedly.
[Brief description of the drawings]
1 to 4 show a first embodiment of the present invention.
FIG. 1 is a perspective view .
FIG. 2 is a cross-sectional view taken along line AA in FIG . 4 in a temporarily fixed state .
3 is a cross-sectional view taken along line AA in FIG . 4 in a fixed state .
FIG. 4 is a perspective view of a pillar mounting state .
FIG. 5 is a perspective view of the second embodiment. FIGS. 6 to 8 show the third embodiment.
FIG. 6 is a perspective view .
FIG. 7 is a cross-sectional view of the masking material attached state .
FIG. 8 is a longitudinal sectional view of a masking material attached state .
9 to 12 show a fourth embodiment of the present invention.
FIG. 9 is a perspective view .
FIG. 10 is a perspective view of a masking material attached state .
11 is a cross-sectional view taken along line AA in FIG .
12 is a sectional view taken along line BB in FIG .
13 to 17 show a fifth embodiment of the present invention.
FIG. 13 is a perspective view of an instrument panel and a masking material before painting .
14 is a cross-sectional view taken along line AA in FIG .
FIG. 15 is a perspective view of a masking material coating state .
16 is a cross-sectional view taken along the line BB in FIG .
FIG. 17 is a perspective view of a different color instrument panel .
[Explanation of symbols]
11,21,31,41,51 Masking material .

Claims (5)

One or more engineering plastics selected from the group consisting of methylpentene copolymer, polysulfone, polyethersulfone, polyphenylene sulfide, polyphenylene ether, polyamideimide, polyetherimide, polyetheretherketone, polyamide and / or polystyrene, A polymer alloy containing a styrenic thermoplastic elastomer, wherein the engineering plastic and the polyamide and / or polystyrene are mixed in a weight ratio of 30:70 to 70:30, and the styrenic thermoplastic elastomer is the engineering plastic. vacuum and with the polyamide and / or polystyrene as the sum of the polymer alloy 2-20 parts by weight are added per 100 parts by weight of the sheet Or pressure forming paint masking material, characterized in that it is manufactured by. The coating masking material according to claim 1 , wherein the polymer alloy sheet has a thickness of 0.1 to 1.5 mm . The coating masking material according to claim 1 or 2 , wherein the engineering plastic is polyphenylene ether . The masking material for coating according to any one of claims 1 to 3 , wherein the polyamide is nylon 6 . The masking material for coating according to any one of claims 1 to 4, wherein the styrenic thermoplastic elastomer is a styrene-hydrogenated polyolefin-styrene block copolymer .

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